大约有 44,000 项符合查询结果（耗时：0.0311秒） [XML]
Struct inheritance in C++
...
answered Jun 11 '09 at 3:44
Alex MartelliAlex Martelli
724k148148 gold badges11261126 silver badges13241324 bronze badges
...
Order data frame rows according to vector with specific order
...
Try match:
df <- data.frame(name=letters[1:4], value=c(rep(TRUE, 2), rep(FALSE, 2)))
target <- c("b", "c", "a", "d")
df[match(target, df$name),]
name value
2 b TRUE
3 c FALSE
1 a TRUE
4 d FALSE
It will work as long as your target contains exactly...
Is effective C++ still effective?
...ctor parameter-independent code out of
templates? (Items 13, 22, 35, and 44.) Yes, yes, yes, yes! My goal has
always been for Effective C++'s table of contents to summarize the
advice in the book, and that summary remains just as applicable to
C++0x development as to “traditional” C++ de...
How Pony (ORM) does its tricks?
...address 1
2 |matthew@example.com|*** |Matthew Reed |USA |address 2
4 |rebecca@example.com|*** |Rebecca Lawson|USA |address 4
The select() function accepts a python generator as argument, and then analyzes its bytecode.
We can get bytecode instructions of this generator using standar...
How can I delete the current line in Emacs?
...-S-backspace # deletes 5 whole lines
C-u C-S-backspace # delete 4 whole lines. C-u without a number defaults to 4
C-u -5 C-S-backspace # deletes previous 5 whole lines
M--5 C-S-backspace # deletes previous 5 whole lines
Sometimes I also find C-x z helpful:
C-S-backspace ...
Creating a new column based on if-elif-else condition
...
4 Answers
4
Active
...
C++0x lambda capture by value always const?
...
answered May 14 '10 at 16:06
Edward StrangeEdward Strange
38.1k77 gold badges6161 silver badges120120 bronze badges
...
Are default enum values in C the same for all compilers?
...
4 Answers
4
Active
...
Write to .txt file?
...e a little piece of text into a .txt file?
I've been Googling for over 3-4 hours, but can't find out how to do it.
3 Answ...
SQLite - replace part of a string
...
AndrewAndrew
2,24011 gold badge1313 silver badges99 bronze badges
...